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Received my Darkvoice today. I am very impressed with the external build quality fit and finish (haven't looked inside yet.) On switch on I' ve got a hum. The hum is independent of the volume control position. Anyone any suggestions?
This is a factor of two things:
- The 6sn7 tube requires some burn in.
- You're using low impedance/high sensitivity headphones.
In general it's mostly the first aspect.
So to remedy:
- remove the larger power tube, and leave the smaller 6sn7 tube in the Darkvoice. Then leave the device on for a day or two.
That should clear out the humming.
Thanks. The hum is the same using DT800 of TR50P. I've tried the stock 6SN7 and two different NOW Russian valves. It is a little quieter with the stock tube. I'll try your method and see how it goes. I've seen another way that involves soldering two capacitors but l am reluctant to go down that road at the moment. Thanks again.
I bought 8 Russian 6SN7 equivalent tubes, but they all hum badly, I mean BADLY. 4 of them were from a US seller, the other 4 were from Russia directly.
On the other hand, I have bought many US made 6SN7 tubes for this amp, most of them are quiet, only 2-3 of them hum.
Interesting but it seems like a lottery. Keep buying 6SN7 s until you get a non hummer. Some 6Ns are eye wateringly expensive others are very cheap. what do you go for?
Those tubes should only be used as guinea pigs when you've done a mod. However there is a Russian mil. spec tube that is very, very good - the 1578 but they don't come cheap and havn't done for years. In fact I've just finished a session using it as the driver with a Svetlana as o/put. At useable sound level there is no hum with this tube.
If you decide to shell out for one be very careful that you are buying the real thing as there are many scammers operating in the Russian Federation and other East European countries. The guy I bought from in the Ukraine sold out years ago, make sure you can see the 5 hole plate - there's one for sale now from the Ukraine @ $US79, that's the right price. The hum mod is really easy because of the point-to-point construction. Actually the supplied Chinese tubes aren't that bad at all and definitely don't hum.
I only got my D/V 2 days ago and after trying it with the supplied tubes I just had to use my no. 1 choice of pre-amp tube the 6F8G Tung Sol RP as driver and with a GE 6AS7 GA as o/put tube with Beyer DT990 Premium cans well - unbelieveable bass, detail, depth BUT at the top end a bright edge, without this this combo would have been absolutely stunning, the Tung Sol is blameless, sadly they are very expensive today. Part of the bright edge could be because the resistors round the driver tube are metal film.
I have had my DV for 2 days now. Day one everything was clear. On day 2 Ian getting intermittent static in the left and right channels. Is this a tube issue?
My day 2 chain is same as day 1. Plex/Google Play Musiv -> Chromecast Audio -> DV 336SE -> 6xx
If I were to take a stab in the dark, your phone/Plex/Google play device or Chromecast probably emits with enough radio waves to cause some interference.
Edit: Googled the issue, are you powering the Chromecast with the provided power adapter?
Yes. CCA is power with delivered adapter. It's possible that is causing the static. I have never had any issues like this before with it, but I also realize the DV maybe more sensitive to interference. I'll try another source and see if I still get the static.
Also, the static seemed to go away after 2 hours of listening this morning.
Cables. I switched the 3.5mm to RCA cable I was using to connect the CCA to the DV and static disappeared. Cables matter!